7. The Baltic Sea Object
In 2011, a Swedish ocean diving team stumbled upon a strange object under the northern Baltic Sea. Known as the Baltic Sea object, this 14,000-year-old object exhibits a rounded, man-made shape, reminiscent of a spacecraft. The unexplained origin of this object has led to speculation about its nature, ranging from an ancient crash site to an underwater temple. Until further investigation is conducted, it will remain an intriguing and mysterious artifact.
